Mobile user interface device



FIG. 1 is a top view of a mobile user interface device showing my design;

FIG. 2 is a bottom view thereof;

FIG. 3 is left side view thereof;

FIG. 4 is right side view thereof;

FIG. 5 is rear view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a top perspective view thereof. 

The ornamental design for a mobile user interface device, as shown and described. 